The correct answer is C. MigrationDirector for NAS.

Huawei's technical structure for storage migration separates migration solutions according to the layer at which data is accessed and moved. The official training diagram associates NAS storage migration with the file-system layer and identifies MigrationDirector for NAS as the dedicated migration tool.

NAS data exists as files and directories exposed through file protocols rather than as raw SAN block devices. MigrationDirector for NAS therefore works with file-system-oriented migration workflows. Huawei's NAS migration procedure uses a migration server, configures a migration task, performs initial synchronization, applies access permissions and quotas as required, then performs incremental synchronization and service cutover.

MigrationDirector for SAN belongs to block/SAN migration rather than the host file-system layer. Similarly, a generic block migration tool would operate below the file-system abstraction.

Therefore, for the host file system layer, the dedicated Huawei migration solution is MigrationDirector for NAS.

Study Guide Topics: Data Migration Solution Technical Structure File System Layer NAS Migration MigrationDirector for NAS.